Portable power module tester

Abstract

The utility model relates to a portable power module tester which comprises a box body, and a power supply module, an electric quantity detection module, a constant current test module and a main control board are installed in the box body. The power supply module comprises a power supply main switch, the power supply main switch is connected to a null-live wire of a three-phase external power supply, a USB socket is connected to the null-live wire connected to the power supply main switch, a null wire connecting end of the USB socket is connected to the power supply module in parallel, a branch null-live wire is connected to the null-live wire of the three-phase external power supply in parallel, and a first voltage device is connected to the branch null-live wire in parallel. The two sides of the first voltage device are connected with a first coulombmeter. According to the product, a complex power module test platform of a converter is subjected to integrated design, and the health state of a power module is judged through test data and waveforms; front-line personnel are promoted to carry out accurate power module fault positioning and product detection; the risk of module explosion caused by uncontrollable spare part state of the field power module is greatly reduced; and a reliable detection data basis is provided for deep regular inspection and maintenance of the old station converter.

Description

Technical Field

[0001] The utility model relates to the field of converter inspection and maintenance, in particular to a portable power module tester. Background Art

[0002] In a wind turbine, the converter provides a low-frequency AC excitation power supply to the rotor, so that not only the stator of the generator can feed power to the grid, but the rotor can also absorb or supply power to the grid, that is, to achieve a two-way flow of electric energy, so that it can regulate both reactive power and active power. The converter is one of the most core components of a wind turbine. With the increase of service life, the failure rate is getting higher and higher, seriously affecting the power generation efficiency of the unit. According to statistics, the failures caused by the converter power module and the driver board currently account for an increasing proportion of the total converter failures, and the failure of the power module and the driver board is very likely to cause secondary failures such as explosion and fire, leading to the expansion of the failure and endangering the safe operation of the unit. Through investigation, it was found that the current IGBT driver boards lack effective detection methods. When the converter power module fails, the on-site maintenance personnel often have no appropriate detection equipment, resulting in a long troubleshooting time, or directly replace all power units or even replace the converter as a whole to troubleshoot the fault. At present, the power modules of converters are very susceptible to moisture after long-term operation and transportation. Due to the lack of effective detection methods, their quality cannot be guaranteed, resulting in converter failures and repeated replacement of power modules or machine explosions. This not only seriously delays the repair time and causes power loss, but also leads to a certain amount of spare parts waste, which cannot meet the needs of lean inspection and maintenance work. Conventional power module detection methods have the following main disadvantages:

[0003] In order to reduce the possibility of accidents during the testing of power modules / driver boards, a multimeter is required to perform static tests on IGBTs before power-on testing. Only after the static tests are completed can driver board tests and high-voltage tests be performed, which requires a high level of technical skills from testers; only fixed pulse width drive waveforms can be provided, and an oscilloscope and a multimeter are required to complete driver board tests; it is impossible to complete overall testing of the power module / driver board, automatic testing, three-phase testing, and dynamic testing of the power module / driver board, and whether the power module / driver board is in a normal state requires on-site testers to judge, and there are many subjective and uncontrollable factors, making large-scale batch implementation difficult. In response to the above problems, in order to improve the efficiency of in-plant testing and facilitate on-site detection and fault location of power modules / driver boards. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a portable power module tester to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solutions adopted are as follows:

[0006] A portable power module tester comprises a box body, in which a power supply module, a power detection module, a constant current test module and a main control board are installed;

[0007] The power supply module includes a main power switch, which is connected to the neutral line N and the live line L of the three-phase external power supply. The neutral line N and the live line L connected to the main power switch are connected to a USB socket, and the neutral line N and the live line L of the USB socket are connected in parallel to a 220V to 24V power module. The neutral line N' and the live line L' of the three-phase external power supply are connected in parallel. The neutral line N' and the live line L' are connected in parallel to a voltage regulator 1, and both sides of the voltage regulator 1 are connected to an electric quantity meter 15, and the output end of the voltage regulator 1 is the neutral line Nx' and the live line Lx';

[0008] The power detection module includes a branch switch 1 and a branch switch 2. The output end of the voltage meter 1 is connected to the branch switch 1 and the branch switch 2 in parallel on the neutral line Nx' and the live line Lx'. The output end of the branch switch 1 is connected to the rectifier module to convert the AC power into DC power. The output end of the rectifier module is connected to the power meter 2 in parallel. The output end of the 220V to 24V power module is connected to the isolation power module. The isolation power module is connected to the power meter 2.

[0009] The output end of the branch switch 2 is connected to the voltage device 2, and the electricity meter 3 is connected in series to the neutral line connected to the voltage device 2. At the same time, the electricity meter 3 is connected to the neutral line N' and the live line L';

[0010] A constant current test module, comprising a constant current module, a neutral line N' and a live line L' are connected to the constant current module, and an output end of the constant current module is connected in series to a fourth electric quantity meter;

[0011] The main control board is connected to a 220V to 24V power module, a coded digital switch is connected to the main control board, and a double pulse switch and a PWM switch are connected to the main control board.

[0012] As a further improvement of the utility model, an inductor and a cooling fan are installed in the box, and the cooling fan is connected to the output end of the power module that reduces 220V to 24V.

[0013] As a further improvement of the utility model, a temperature control switch is connected to the access circuit of the heat dissipation fan.

[0014] As a further improvement of the utility model, the output end of the rectifier module is connected in parallel to a protective resistor 1, the access end of the protective resistor 1 is connected to a contactor, the contactor is connected to the live wire L', and the live wire L' is connected to the neutral wire N' through a branch switch 3; the input end of the voltage regulator 2 is connected to a protective resistor 2.

[0015] As a further improvement of the utility model, the live wire access end of the constant current module is connected to branch switch three, the output end of the constant current module is connected in parallel to the discharge resistor, and the discharge resistor circuit is connected to branch switch four.

[0016] The beneficial effects of the utility model are:

[0017] The utility model integrates the design of a complex power module test platform for the converter, determines the health status of the power module through test data and waveforms; promotes front-line personnel to carry out accurate power module fault location and product testing; greatly reduces the risk of module explosion caused by uncontrollable status of on-site power module spare parts; and provides reliable detection data basis for in-depth regular inspection and maintenance of old station converters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a circuit diagram of the power supply module in the utility model;

[0020] Figure 2 This is a circuit diagram of the power detection module in the utility model;

[0021] Figure 3 This is a circuit diagram of the constant current test module in the utility model;

[0022] Figure 4 It is the circuit diagram of the main control board in the utility model. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] Please refer to Figure 1-4 , a portable power module tester, comprising a box, in which a power supply module 1, a power detection module 2, a constant current test module 3 and a main control board 4 are installed;

[0026] The power supply module 1 comprises a main power switch 11, which is connected to the neutral line N and the live line L of the three-phase external power supply. The neutral line N and the live line L connected to the main power switch 11 are connected to a USB socket 12, and the neutral line N and the live line L of the USB socket 12 are connected in parallel to a 220V to 24V power supply module 13, the neutral line N' and the live line L of the three-phase external power supply are connected in parallel to the neutral line N and the live line L, the neutral line N' and the live line L' are connected in parallel to a voltage regulator 14, the two sides of the voltage regulator 14 are connected to an electric quantity meter 15, the output end of the voltage regulator 14 is a neutral line Nx' and a live line Lx', and the live line Lx' at the output end of the voltage regulator 14 is connected to a fuse 16;

[0027] The power detection module 2 includes a branch switch 1 21 and a branch switch 2 22. The output end of the voltage regulator 1 14 is connected to the branch switch 1 21 and the branch switch 2 22 in parallel on the neutral line Nx' and the live line Lx'. The output end of the branch switch 1 21 is connected to the rectifier module 23 to convert the AC power into DC power. The output end of the rectifier module 23 is connected to the power meter 2 24 in parallel. The output end of the 220V to 24V power module 13 is connected to the isolation power module 131, and the isolation power module 131 is connected to the power meter 2 24; the output end of the rectifier module 23 is connected to the protection resistor 1 25 in parallel, and the access end of the protection resistor 1 25 is connected to the contactor 26, and the contactor 26 is connected to the live line L', and the live line L' is connected to the neutral line N' through the branch switch 3 27;

[0028] The output end of the branch switch 22 is connected to the transformer 28, and the neutral line connected to the transformer 28 is connected in series with the electricity meter 3 29. At the same time, the electricity meter 3 29 is connected to the neutral line N' and the live line L'; the input end of the transformer 28 is connected to the protection resistor 20.

[0029] The constant current test module 3 includes a constant current module 31, the neutral line N' and the live line L' are connected to the constant current module 31, the output end of the constant current module 31 is connected in series to the electric meter 4 32, the live line access end of the constant current module 31 is connected to the branch switch 4 33, the output end of the constant current module 31 is connected in parallel to the discharge resistor 34, and the discharge resistor 34 circuit is connected to the branch switch 5 35;

[0030] The main control board 4 is connected to the power supply module 13 that reduces 220V to 24V, the main control board 4 is connected to the coded digital switch 41, and the main control board 4 is connected to the dual pulse switch 42 and the PWM switch 43.

[0031] An inductor 5 and a cooling fan 6 are installed in the box. The cooling fan 6 is connected to the output end of the 220V to 24V power module 13. A temperature control switch 61 is connected to the access circuit of the cooling fan 6.

[0032] Construct multiple machine model detection: suitable for maintenance and testing of multiple models of converter modules;

[0033] Expanded multi-interface detection: can expand the pitch drive and photovoltaic power module interfaces for module detection;

[0034] Refined detection: built-in intelligent wave module, capable of various refined detections such as double pulse test and PWM test;

[0035] Diversified application scenarios: module grid-connected debugging, performance testing, performance testing after waste utilization, etc.

[0036] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A portable power module tester, comprising a box, characterized in that: The box is equipped with a power supply module, a power detection module, a constant current test module and a main control board; The power supply module includes a main power switch, which is connected to the neutral line N and the live line L of the three-phase external power supply. The neutral line N and the live line L connected to the main power switch are connected to a USB socket, and the neutral line N and the live line L of the USB socket are connected in parallel to a 220V to 24V power module, and the neutral line N' and the live line L of the three-phase external power supply are connected in parallel. The neutral line N' and the live line L' are connected in parallel to a voltage regulator 1, and both sides of the voltage regulator 1 are connected to an electric quantity meter 1, and the output end of the voltage regulator 1 is a neutral line Nx' and a live line Lx'; The power detection module includes a branch switch 1 and a branch switch 2. The output end of the voltage meter 1 is connected to the branch switch 1 and the branch switch 2 in parallel on the neutral line Nx' and the live line Lx'. The output end of the branch switch 1 is connected to the rectifier module to convert the AC power into DC power. The output end of the rectifier module is connected to the power meter 2 in parallel. The output end of the 220V to 24V power module is connected to the isolation power module. The isolation power module is connected to the power meter 2. The output end of the branch switch 2 is connected to the voltage device 2, and the electricity meter 3 is connected in series to the neutral line connected to the voltage device 2. At the same time, the electricity meter 3 is connected to the neutral line N' and the live line L'; A constant current test module, comprising a constant current module, a neutral line N' and a live line L' are connected to the constant current module, and an output end of the constant current module is connected in series to a fourth electric quantity meter; The main control board is connected to a 220V to 24V power module, a coded digital switch is connected to the main control board, and a double pulse switch and a PWM switch are connected to the main control board.

2. A portable power module tester according to claim 1, characterized in that: An inductor and a cooling fan are installed in the box, and the cooling fan is connected to the output end of a 220V to 24V power module.

3. A portable power module tester according to claim 2, characterized in that: A temperature control switch is connected to the access circuit of the cooling fan.

4. A portable power module tester according to claim 1, characterized in that: The output end of the rectifier module is connected in parallel to the protection resistor 1, the access end of the protection resistor 1 is connected to the contactor, the contactor is connected to the live wire L', and the live wire L' is connected to the neutral wire N' through the branch switch 3; the input end of the transformer 2 is connected to the protection resistor 2.

5. A portable power module tester according to claim 1, characterized in that: The live wire access end of the constant current module is connected to branch switch three, the output end of the constant current module is connected in parallel to the discharge resistor, and the discharge resistor circuit is connected to branch switch four.

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